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Polyacrylamide production methods are solution polymerization, emulsion and inverse emulsion polymerization and radiation polymerization method.
1 solution polymerization
Aqueous solution polymerization is the traditional method of production of polyacrylamide, using this method can produce polyacrylamide gels and powder products. General polyacrylamide colloid 8% -10% aqueous solution of acrylamide in the role of initiator directly polymerized; polyacrylamide powder is more polymerized with 25% -30% acrylamide solution, after the polymerization by polyacrylamide colloid granulation, kneading, drying, crushing obtained after product. Wherein the polymerization reaction is a key step. The method has simple production safety, process equipment and low cost of production, etc., is currently abroad method commonly used in the production of polyacrylamide. Using this method of production of polyacrylamide disc polymerization earliest use hand-workshop-style, then using a kneading machine. Developed in the late 1980s, the conical kettle polymerization process, testing by the five nuclear industry where chemical plant Jiangdu success. 1990s polymerization techniques from abroad, similar to the domestic technology, but the reactor can be rotated, the volume of the polymerization vessel is also large, up to 5000 liters.
2 emulsion polymerization and inverse emulsion polymerization
Emulsion polymerization is another important synthesis method polyacrylamide, which is a conventional operation in the dispersed aqueous acrylamide solution in an organic solvent such as gasoline, with vigorous stirring, the solution was uniformly dispersed emulsion system is formed, followed by the addition of acrylamide initiator reaction of polyacrylamide. Features of this method is the high rate of polymerization conditions at high conversion rate can be high molecular weight products (latex or powder).
Inverse emulsion polymerization method is a method by means of a water-soluble acrylamide surfactant (use of non-ionic surfactant) the action of acrylamide monomer is dispersed in the oil phase to form the emulsion system, the role of initiator in the emulsion polymerization is carried out to form a stable high molecular weight polyacrylamide instant latex products, after dehydration by azeotropic distillation to obtain a powdery polyacrylamide. Since the polymerization reaction is dispersed in the oil phase particles carried acrylamide, and thus in the polymerization process for distributing uniformly the heat released, the reaction system was stable, easy to control, suitable for the preparation of high molecular weight and a narrow molecular weight distribution latex or polyacrylamide powder products.
3 radiation-induced method
Radiation-induced method acrylamide monomer polymerization initiator direct solid polyacrylamide products or γ- ultraviolet rays. The production process is simple, but the equipment investment and the molecular weight distribution of the resulting product is very wide, so there is no large-scale industrial production.